Rotary valve for pipe lines



J. SCHNYD ER noun? VALVE FQR PIPE muss Original Filed Jan. 6,- 1927Patented Oct. 25, 1927.

UNITED STATES 1 1,646,631 PATIENT OFFICE.

JOHANN scnn nna, or KRIENS-LUZERN, swrrznnnann assrenon To FIRM ACTIENeensnnnscnarr DER mascnmnnranmx VON 'rHEon'on BELL & cm, or KRIENS-LUZERnkSWITZERLAND.

Original application filed January 6, 1927, Serial No. 159,465, anal..-Germany July 29, 1925. Divided ROTARY VALVE FOR PIPE LINES.

and this application filed April 25, 1927. Serial No. 186,475.

The present invention relates to improvements in rotary valves for pipelines and is a division application Ser. No. 159,465, filed January6,1927;

With the rotary valve according to the present invention one of thefulcrum pins .is mounted with clearance in its bearing to permit arelief of pressure when opening the valve as well as when closing itinasmuch as the device for actuating the gate acts upon the latterthrough the intermediary of an abutment member fixed to the fulcrum pinsin such a manner that previous to the turning of the gate and duringthat turning the '15 gate is lifted off its seat against the opposingwater pressure.

A constructional example of the subject matter of the present inventionis illustrated on the accompanying drawings, in which:

Fig. 1 is a, vertical section of the-valve provided with means foroperating the valve by pressure liquid and Fig. 2 1s a plan view of Fig.1 with parts shown in section along line IV-IV in The bipartite valvecasing 1 is provided with the two bearing parts 2 and 3, in which thefulcrum pins 5 and 6 of the rotary gate body 4 are rotatably mounted,the gate rest so ing on a seat 3 of the casing for obturat-ion purposes.The fulcrum in 6 fits into its bearing 3 with a small c earance 6. Withthe valve casing a casing 12 for a rotary piston is cast in one or it isfixed thereto by screws. In the casing 12 a rotary piston 13 isrotatably mounted having two blades 22 and 23 provided with resilienttightening strips 29 for packing the blades against the I casing 12. Astationary partition wall 16 4o subdivides the space inside the casing12 and to one side of the blades intoan opening chamber 14 and a closingchamber 15. A small hole 17 is provided in the partition wall 16. 19 and20 denote channels connecting the chambers with the chamber 26 formed bya chest 27 fixed to the casing 12. Intermediate of the channels 19 and20 a discharge opening 21 is arranged leading into the 0 en. By means ofthe ipe 28 pressure liqui is admitted to the c amber 26 and the flow ofthe liquid through the channels 19, 20 or 21 -respectively is controlledby an ordinary slide valve 18 operated by a rack 36 and pinion 31.Obviously instead of provid ng the hole 17 in the wall 16 acommunication between the chambers 14 and 15 may be provided by thecontrolling valve itself.

Assume the rotary valve to be closed and the rotary piston 13 to take upthe position snown m lfig. 2. If new the valve has to be opened theslide valve 18 is adjusted into tlregaosition illustrated in Fig. 2. Thepressure "li'iiiiid entering through the channel 19 fills first of ailthe chamber 14 and flows then tl1ro11gl .thi *hole 17 into the chamber15. As the pressure liquid in the latter chamber may escape throughchannel 20 and vdischarge opening 21" a larger hydraulic pressure isgenerated in the chamber 14 than 1n the chamber 15. These two unequalpressures on the two blades of the rotary piston 13 are indicated by thepressures P and P (Fig. 2). .When the valve is almost in its closedposition the sum of the "forces multiplied bythe ratio of the lever armsa/b yields a force acting approximately in the center of the valve andbeing opposed to the water pressure Q. The difierence of the forces P -Pcorresponds to the turning moment available for turning the gate body.By suitably choosing and throttling by means of the, slide valve 18 thecross-sections of the channels 19 and 20 and of the hole 17 the gate maybe of the pressure. On closing the valve the opposite movement occurs.When the valve is completely open the blades 22 and 23 are in theposition shown in dotted lines in Fig. 2. The slidevalve 18 is sodisplaced that pressure liquid enters chamber 15 through channel 20 andflows through hole 17 intov chamber 14, the latter being connected tothe open by the channel 19 and opening 21, whereby a force opposed tothe water pressure is generated in the manner described above. Thisforce acts as long as liquid pressure is present in the chambers 14 and15. If the pressure liquid supply is then cut Off the gate body ispressed against its seat by the water pressure in the pipe line wherebythe desired tightening effect is obtained.

I claim: I 1. A'rotary valve for pipe lines, comprising in combination,a valve casing provided with a seat and bearings, a gate body havingfulcrum pins rotatably mounted in said partly or wholly relievedbearings, one of said pinsfitting with play in its bearing, and saidgate body being adapted to cooperate with said seat 7 for obturationpurposes, a rotary piston provided with blades and fixed to one of saidfulcrum pins and a casing in which said piston is adapted to turn, apartition Wall rovided in said piston casing and subdividing the spacebetween said blades into working chambers, said partition Wall beingprovided with a hole, and means adapted to control the flow of pressureliquid to and from said chambers for effecting by the liquid pressure arelief of the gate body and a turning of the latter.

2. A rotary valve for pipe lines, comprising in combination, a valvecasing provided with a seat and bearings, a gate body having fulcrumpins rotatably mounted in said bearings, one of said pins fitting withplay in its bearing, and said gate body being chambers, means adapted tosupplypressure v liquid to said chest, and a valve adapted to controlthe flow of pressure. liquid to and from said chambers for effecting bythe liquid pressure a relief of thegate body and a turning of thelatter.

In testimony whereof, I have name to this specification.

JOHANN soHNvbER.

signed my i I i

